drivers/spi/spi-pxa2xx-pci.c

   1 /*
   2  * CE4100's SPI device is more or less the same one as found on PXA
   3  *
   4  */
   5 #include <linux/pci.h>
   6 #include <linux/platform_device.h>
   7 #include <linux/of_device.h>
   8 #include <linux/module.h>
   9 #include <linux/spi/pxa2xx_spi.h>
  10 #include <linux/clk.h>
  11 #include <linux/clk-provider.h>
  12
  13 #include <linux/dmaengine.h>
  14 #include <linux/platform_data/dma-dw.h>
  15
  16 enum {
  17         PORT_CE4100,
  18         PORT_BYT,
  19         PORT_BSW0,
  20         PORT_BSW1,
  21         PORT_BSW2,
  22 };
  23
  24 struct pxa_spi_info {
  25         enum pxa_ssp_type type;
  26         int port_id;
  27         int num_chipselect;
  28         unsigned long max_clk_rate;
  29
  30         /* DMA channel request parameters */
  31         void *tx_param;
  32         void *rx_param;
  33 };
  34
  35 static struct dw_dma_slave byt_tx_param = { .dst_id = 0 };
  36 static struct dw_dma_slave byt_rx_param = { .src_id = 1 };
  37
  38 static struct dw_dma_slave bsw0_tx_param = { .dst_id = 0 };
  39 static struct dw_dma_slave bsw0_rx_param = { .src_id = 1 };
  40 static struct dw_dma_slave bsw1_tx_param = { .dst_id = 6 };
  41 static struct dw_dma_slave bsw1_rx_param = { .src_id = 7 };
  42 static struct dw_dma_slave bsw2_tx_param = { .dst_id = 8 };
  43 static struct dw_dma_slave bsw2_rx_param = { .src_id = 9 };
  44
  45 static bool lpss_dma_filter(struct dma_chan *chan, void *param)
  46 {
  47         struct dw_dma_slave *dws = param;
  48
  49         if (dws->dma_dev != chan->device->dev)
  50                 return false;
  51
  52         chan->private = dws;
  53         return true;
  54 }
  55
  56 static struct pxa_spi_info spi_info_configs[] = {
  57         [PORT_CE4100] = {
  58                 .type = PXA25x_SSP,
  59                 .port_id =  -1,
  60                 .num_chipselect = -1,
  61                 .max_clk_rate = 3686400,
  62         },
  63         [PORT_BYT] = {
  64                 .type = LPSS_SSP,
  65                 .port_id = 0,
  66                 .num_chipselect = 1,
  67                 .max_clk_rate = 50000000,
  68                 .tx_param = &byt_tx_param,
  69                 .rx_param = &byt_rx_param,
  70         },
  71         [PORT_BSW0] = {
  72                 .type = LPSS_SSP,
  73                 .port_id = 0,
  74                 .num_chipselect = 1,
  75                 .max_clk_rate = 50000000,
  76                 .tx_param = &bsw0_tx_param,
  77                 .rx_param = &bsw0_rx_param,
  78         },
  79         [PORT_BSW1] = {
  80                 .type = LPSS_SSP,
  81                 .port_id = 1,
  82                 .num_chipselect = 1,
  83                 .max_clk_rate = 50000000,
  84                 .tx_param = &bsw1_tx_param,
  85                 .rx_param = &bsw1_rx_param,
  86         },
  87         [PORT_BSW2] = {
  88                 .type = LPSS_SSP,
  89                 .port_id = 2,
  90                 .num_chipselect = 1,
  91                 .max_clk_rate = 50000000,
  92                 .tx_param = &bsw2_tx_param,
  93                 .rx_param = &bsw2_rx_param,
  94         },
  95 };
  96
  97 static int pxa2xx_spi_pci_probe(struct pci_dev *dev,
  98                 const struct pci_device_id *ent)
  99 {
 100         struct platform_device_info pi;
 101         int ret;
 102         struct platform_device *pdev;
 103         struct pxa2xx_spi_master spi_pdata;
 104         struct ssp_device *ssp;
 105         struct pxa_spi_info *c;
 106         char buf[40];
 107         struct pci_dev *dma_dev;
 108
 109         ret = pcim_enable_device(dev);
 110         if (ret)
 111                 return ret;
 112
 113         ret = pcim_iomap_regions(dev, 1 << 0, "PXA2xx SPI");
 114         if (ret)
 115                 return ret;
 116
 117         c = &spi_info_configs[ent->driver_data];
 118
 119         memset(&spi_pdata, 0, sizeof(spi_pdata));
 120         spi_pdata.num_chipselect = (c->num_chipselect > 0) ?
 121                                         c->num_chipselect : dev->devfn;
 122
 123         dma_dev = pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0));
 124
 125         if (c->tx_param) {
 126                 struct dw_dma_slave *slave = c->tx_param;
 127
 128                 slave->dma_dev = &dma_dev->dev;
 129                 slave->src_master = 1;
 130                 slave->dst_master = 0;
 131         }
 132
 133         if (c->rx_param) {
 134                 struct dw_dma_slave *slave = c->rx_param;
 135
 136                 slave->dma_dev = &dma_dev->dev;
 137                 slave->src_master = 1;
 138                 slave->dst_master = 0;
 139         }
 140
 141         spi_pdata.dma_filter = lpss_dma_filter;
 142         spi_pdata.tx_param = c->tx_param;
 143         spi_pdata.rx_param = c->rx_param;
 144         spi_pdata.enable_dma = c->rx_param && c->tx_param;
 145
 146         ssp = &spi_pdata.ssp;
 147         ssp->phys_base = pci_resource_start(dev, 0);
 148         ssp->mmio_base = pcim_iomap_table(dev)[0];
 149         if (!ssp->mmio_base) {
 150                 dev_err(&dev->dev, "failed to ioremap() registers\n");
 151                 return -EIO;
 152         }
 153         ssp->irq = dev->irq;
 154         ssp->port_id = (c->port_id >= 0) ? c->port_id : dev->devfn;
 155         ssp->type = c->type;
 156
 157         snprintf(buf, sizeof(buf), "pxa2xx-spi.%d", ssp->port_id);
 158         ssp->clk = clk_register_fixed_rate(&dev->dev, buf , NULL,
 159                                         CLK_IS_ROOT, c->max_clk_rate);
 160          if (IS_ERR(ssp->clk))
 161                 return PTR_ERR(ssp->clk);
 162
 163         memset(&pi, 0, sizeof(pi));
 164         pi.parent = &dev->dev;
 165         pi.name = "pxa2xx-spi";
 166         pi.id = ssp->port_id;
 167         pi.data = &spi_pdata;
 168         pi.size_data = sizeof(spi_pdata);
 169
 170         pdev = platform_device_register_full(&pi);
 171         if (IS_ERR(pdev)) {
 172                 clk_unregister(ssp->clk);
 173                 return PTR_ERR(pdev);
 174         }
 175
 176         pci_set_drvdata(dev, pdev);
 177
 178         return 0;
 179 }
 180
 181 static void pxa2xx_spi_pci_remove(struct pci_dev *dev)
 182 {
 183         struct platform_device *pdev = pci_get_drvdata(dev);
 184         struct pxa2xx_spi_master *spi_pdata;
 185
 186         spi_pdata = dev_get_platdata(&pdev->dev);
 187
 188         platform_device_unregister(pdev);
 189         clk_unregister(spi_pdata->ssp.clk);
 190 }
 191
 192 static const struct pci_device_id pxa2xx_spi_pci_devices[] = {
 193         { PCI_VDEVICE(INTEL, 0x2e6a), PORT_CE4100 },
 194         { PCI_VDEVICE(INTEL, 0x0f0e), PORT_BYT },
 195         { PCI_VDEVICE(INTEL, 0x228e), PORT_BSW0 },
 196         { PCI_VDEVICE(INTEL, 0x2290), PORT_BSW1 },
 197         { PCI_VDEVICE(INTEL, 0x22ac), PORT_BSW2 },
 198         { },
 199 };
 200 MODULE_DEVICE_TABLE(pci, pxa2xx_spi_pci_devices);
 201
 202 static struct pci_driver pxa2xx_spi_pci_driver = {
 203         .name           = "pxa2xx_spi_pci",
 204         .id_table       = pxa2xx_spi_pci_devices,
 205         .probe          = pxa2xx_spi_pci_probe,
 206         .remove         = pxa2xx_spi_pci_remove,
 207 };
 208
 209 module_pci_driver(pxa2xx_spi_pci_driver);
 210
 211 MODULE_DESCRIPTION("CE4100/LPSS PCI-SPI glue code for PXA's driver");
 212 MODULE_LICENSE("GPL v2");
 213 MODULE_AUTHOR("Sebastian Andrzej Siewior <bigeasy@linutronix.de>");